If you are still researching this line: there is a Hermann Zeugner, died in Aug. 1929, and whose death notice is published in the local German newspapers. Some brief entries are:
1900 - Zeugner, Hildegard Emilie
1900 - Zeugner, Lizzie (née Scheuermann)
1907 - Zeugner, Robert
1929 - Zeugner, Herman
Indexing Milwaukee's German newspapers continuously since 2007 ...
Gary Rebholz, compiler/editor
"Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).